How do thorns grow?

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Tags

1. #roses
2. #predators
3. #instead
4. #plant
5. #these
6. #actually
7. #modified
8. #thing
9. #defend
10. #overall
11. #spines
12. #against
13. #branch
14. #plants
15. #types
16. #growths
17. #prickles
18. #other
19. #cacti
20. #thorns
21. #which